During a normal Swallowing sequences ,the smooth muscle which surrounds the gastro esophageal junction.
A)Remains tonically constricted until the bolus arrives at this junction.
B)Relaxes even before the oncoming peristaltic wave has arrived.
C)constricts further on the passing bolus and allows a gradual esophageal emptying.
D)Is never constrict at all , and has no participation of any kind in the Swallowing process.

Question

Quizplus · Accepted Answer

The smooth muscle surrounding the gastroesophageal junction relaxes in anticipation of the oncoming peristaltic wave, allowing the bolus to pass into the stomach. This anticipatory relaxation is coordinated by the swallowing reflex and neural control mechanisms to ensure smooth passage of the bolus.

During a Normal Swallowing Sequences ,The Smooth Muscle Which Surrounds